Abstract: This paper investigates the inhibitory effects of RL juice, Fruit-Cola, PCR powder on the formafion of N-Nitrosoprolin in vivo in rats. The results indicate That RL juice, Fruit-Cola, PCR powder can effectively inhibit the formation of NPRO in rats. The inhibitory rates are 96. 36% ,87. 99% , and 65. 52% respectively.

Key words: Rosa Laerigate(RL) juice Fruit-cola Pericarpium citri reticulatae Rowder (PCR) N-Ni-trosoproline (NPRO)